EP2151965B1 - Method and device for data processing and communication system comprising such device - Google Patents

Method and device for data processing and communication system comprising such device Download PDF

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Publication number
EP2151965B1
EP2151965B1 EP08104987.6A EP08104987A EP2151965B1 EP 2151965 B1 EP2151965 B1 EP 2151965B1 EP 08104987 A EP08104987 A EP 08104987A EP 2151965 B1 EP2151965 B1 EP 2151965B1
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EP
European Patent Office
Prior art keywords
line
central office
customer premises
digital subscriber
user
Prior art date
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Application number
EP08104987.6A
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German (de)
French (fr)
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EP2151965A1 (en
Inventor
Thomas Dr. Haustein
Werner Dr. Kozek
Josef Mück
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Adtran GmbH
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Adtran GmbH
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Priority to EP08104987.6A priority Critical patent/EP2151965B1/en
Priority to PCT/EP2009/060269 priority patent/WO2010015699A1/en
Publication of EP2151965A1 publication Critical patent/EP2151965A1/en
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Publication of EP2151965B1 publication Critical patent/EP2151965B1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03343—Arrangements at the transmitter end
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/32—Reducing cross-talk, e.g. by compensating
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
    • H04M11/062—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors using different frequency bands for speech and other data

Definitions

  • the invention relates to a method and to a device for data processing and to a communication system comprising such a device.
  • DE 10 2006 051 435 A1 refers to a solution for conveying data across several channels which may be distributed among a bundled cable.
  • US 2006/0270360 A1 is directed to an apparatus and a method for transmitting/receiving data in a mobile communication system using multiple antennas.
  • WO 2004/006492 A1 discloses a power control of a digital subscriber line.
  • DSL - digital subscriber line new standards like, e.g., VDSL2 are emerging meeting an increasing load and more demand for bandwidth preferably at low cost. This is often realized by using higher order modulation in order to increase a spectral efficiency in a limited frequency spectrum.
  • fixed in particular refers to stationary or quasi-stationary positioning of a base station or of a central office (CO) and user terminals (UTs).
  • a multi-user configuration comprises several active users that are connected to the CO over wires (copper pairs).
  • DSL is operated in a circuit switch mode for all active lines. Hence, data is transmitted at all times which will cause constant interference to other connections that are deployed with the same cable bundle. If no user data is transmitted, idle data is transmitted in uplink and downlink directions.
  • the problem to be solved is to further improve a signal to interference plus noise ratio (SINR) in an existing point to multipoint environment.
  • SINR signal to interference plus noise ratio
  • joint signal processing as well as joint signal pre-processing allows reducing crosstalk effects and hence improving an overall SINR.
  • said data processing is provided in a point to multipoint environment, in particular in a digital subscriber line environment.
  • the at least one inactive line is detected by a central unit upon notification by a user terminal.
  • Such notification may comprise a message from said user terminal.
  • the central unit may be a central office and/or a DSLAM.
  • the user terminal may be located and/or associated with a CPE.
  • the at least one inactive line is utilized for signal processing in uplink direction.
  • the at least one inactive line is utilized for signal pre-processing in downlink direction.
  • the at least one inactive line is utilized by actively conveying signals in order to reduce a crosstalk and/or interference.
  • the inactive line is a connection between a CO and a CPE with no user data and/or idle signals exchanged between said CPE and the CO.
  • the inactive line is released for normal operation upon detection of a pre-defined signal, in particular a training signal.
  • the CO may release the inactive line (e.g., switch its status to active) and may not actively use it for further joint signal-(pre-)processing.
  • the inactive line e.g., switch its status to active
  • a device comprising a and/or being associated with a processor unit and/or a hard-wired circuit and/or a logic device that is arranged such that the method as described herein is executable on said processor unit.
  • the device is a communication device, in particular a or being associated with a central office or digital subscriber line access multiplexer.
  • a central office In such a DSL system, a central office (CO) is connected with several customer premises equipments (CPEs) via at least one (or several) cables. Within such cable, crosstalk and/or interference may deteriorate the data conveyed between the CO and the CPEs.
  • CO central office
  • CPEs customer premises equipments
  • a joint signal processing may be performed at the CO.
  • the approach provided herewith suggests using at least one inactive line, i.e., at least one line or link between a port of the CO and an CPE that is not active, for extended signal processing purposes in a multi-port (multiple-input-multiple-output, MIMO) scenario.
  • at least one inactive line i.e., at least one line or link between a port of the CO and an CPE that is not active, for extended signal processing purposes in a multi-port (multiple-input-multiple-output, MIMO) scenario.
  • At least one additional port (connected to the inactive line) at the CO may be utilized for detecting crosstalk from the active lines.
  • the additional port (connected to the inactive line) can be used for linear and/or for non-linear pre-coding purposes towards the active users.
  • the CO performs joint detection and/or joint transmission techniques in order to improve the link quality of the active lines.
  • An inactive line could be a line between the CO and a CPE with no data or idle signals transmitted, e.g., a line during a switch-off time of the CPE.
  • the CPE may provide a short message during power-off to the CO indicating that the line will become inactive (from now on) and can thus be used for the joint signal processing.
  • a line that is used for joint signal processing can be released to normal operation when the CPE is switched on (again) and the CO detects a training signal coming from the CPE.
  • the CO may perform joint signal processing using linear or non-linear MIMO detection techniques via its active ports plus any ports (or a selection thereof) connected to inactive users.
  • the additional degrees of freedom of the additional ports conveying no user data or idle data can be efficiently utilized for a better interference suppression between the active communication lines.
  • the CO may perform a joint signal pre-processing using linear or non-linear MIMO pre-coding techniques via its active ports plus any ports connected to inactive users.
  • the additional degrees of freedom of the additional ports at the transmit side can be used for an improved suppression of inter-line crosstalk between the other communication pairs due to an additional transmit diversity.
  • the at least one inactive line may allow for a simplified linear pre-coding technique to provide an efficient interference cancellation.
  • a pre-compensation of inter-stream interference may result in a substantial SINR improvement for individual links in downlink direction.
  • the solution suggested is in particular compatible with existing CPEs.
  • joint signal processing in uplink direction information required is available at the CO side. Hence, no changes of the CPE hardware and/or firmware are required.
  • For joint signal pre-processing in downlink direction no changes of the CPE hardware is needed.
  • a firmware upgrade of the CPE may be beneficial.
  • Fig.1 shows steps of a method to provide an efficient data communication in a point to multipoint environment.
  • the CO determines at least one inactive line.
  • Such inactive line may be detected upon receiving a corresponding notification or message indicating that the remote CPE enters an offline state or is actually being switched off.
  • the CO provides joint signal processing considering incoming traffic on several ports, wherein at least one of such ports is connected to an inactive line (or via such line to an inactive CPE). Knowing which ports are connected to inactive lines, the CO can actively process incoming traffic and hence reduce an interference and/or crosstalk of the traffic conveyed via the still active connections (i.e. connections to still active CPEs).
  • the CO performs a joint signal pre-processing by modifying signals to be conveyed over the lines (including the line(s) connected to inactive CPE(s)) in a way that interference and/or crosstalk is reduced.
  • joint signal processing as well as joint signal pre-processing allows to significantly reduce crosstalk effects and hence improves the overall SINR.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Description

  • The invention relates to a method and to a device for data processing and to a communication system comprising such a device.
  • DE 10 2006 051 435 A1 refers to a solution for conveying data across several channels which may be distributed among a bundled cable.
  • US 2006/0270360 A1 is directed to an apparatus and a method for transmitting/receiving data in a mobile communication system using multiple antennas.
  • WO 2004/006492 A1 discloses a power control of a digital subscriber line.
  • In fixed wired high speed data connection (DSL - digital subscriber line) new standards like, e.g., VDSL2 are emerging meeting an increasing load and more demand for bandwidth preferably at low cost. This is often realized by using higher order modulation in order to increase a spectral efficiency in a limited frequency spectrum.
  • A similar situation may be applicable in a fixed wireless connection as suggested by WIMAX. Hence, reference can be made to all kinds of fixed point to multi-point connections, wherein the term "fixed" in particular refers to stationary or quasi-stationary positioning of a base station or of a central office (CO) and user terminals (UTs).
  • In current DSL systems, a multi-user configuration comprises several active users that are connected to the CO over wires (copper pairs).
  • Furthermore, DSL is operated in a circuit switch mode for all active lines. Hence, data is transmitted at all times which will cause constant interference to other connections that are deployed with the same cable bundle. If no user data is transmitted, idle data is transmitted in uplink and downlink directions.
  • The problem to be solved is to further improve a signal to interference plus noise ratio (SINR) in an existing point to multipoint environment.
  • This problem is solved according to the features of the independent claims. Further embodiments result from the depending claims.
  • In order to overcome this problem, a method for data processing is suggested comprising the steps:
    • determine at least one inactive line;
    • utilize the at least one inactive line for joint signal processing and/or for joint signal pre-processing.
  • Hence, joint signal processing as well as joint signal pre-processing allows reducing crosstalk effects and hence improving an overall SINR.
  • In an embodiment, said data processing is provided in a point to multipoint environment, in particular in a digital subscriber line environment.
  • In another embodiment, the at least one inactive line is detected by a central unit upon notification by a user terminal.
  • Such notification may comprise a message from said user terminal. The central unit may be a central office and/or a DSLAM. The user terminal may be located and/or associated with a CPE.
  • In a further embodiment, the at least one inactive line is utilized for signal processing in uplink direction.
  • In a next embodiment, the at least one inactive line is utilized for signal pre-processing in downlink direction.
  • It is also an embodiment that the at least one inactive line is utilized by actively conveying signals in order to reduce a crosstalk and/or interference.
  • Pursuant to another embodiment, the inactive line is a connection between a CO and a CPE with no user data and/or idle signals exchanged between said CPE and the CO.
  • According to an embodiment, the inactive line is released for normal operation upon detection of a pre-defined signal, in particular a training signal.
  • Hence, in case a training signal is detected from the CPE, the CO may release the inactive line (e.g., switch its status to active) and may not actively use it for further joint signal-(pre-)processing.
  • The problem stated above is also solved by a device comprising a and/or being associated with a processor unit and/or a hard-wired circuit and/or a logic device that is arranged such that the method as described herein is executable on said processor unit.
  • According to an embodiment, the device is a communication device, in particular a or being associated with a central office or digital subscriber line access multiplexer.
  • The problem stated supra is further solved by a communication system comprising the device as described herein.
  • Embodiments of the invention are shown and illustrated in the following figure:
    • Fig.1
    shows steps of a method to provide an efficient data communication in a point to multipoint environment.
  • For the purpose of illustration and as an example of a point to multipoint environment, reference is made to a fixed line connection as utilized by DSL systems.
  • In such a DSL system, a central office (CO) is connected with several customer premises equipments (CPEs) via at least one (or several) cables. Within such cable, crosstalk and/or interference may deteriorate the data conveyed between the CO and the CPEs.
  • When considering an uplink direction or a downlink direction from the CPE to the CO, a joint signal processing may be performed at the CO.
  • The approach provided herewith suggests using at least one inactive line, i.e., at least one line or link between a port of the CO and an CPE that is not active, for extended signal processing purposes in a multi-port (multiple-input-multiple-output, MIMO) scenario.
  • With regard to an uplink direction from the CPE towards the CO, at least one additional port (connected to the inactive line) at the CO may be utilized for detecting crosstalk from the active lines.
  • In downlink direction from the CO to the (several) CPEs, the additional port (connected to the inactive line) can be used for linear and/or for non-linear pre-coding purposes towards the active users.
  • The CO performs joint detection and/or joint transmission techniques in order to improve the link quality of the active lines.
  • An inactive line could be a line between the CO and a CPE with no data or idle signals transmitted, e.g., a line during a switch-off time of the CPE.
  • In such case, the CPE may provide a short message during power-off to the CO indicating that the line will become inactive (from now on) and can thus be used for the joint signal processing. This advantageously avoids that joint processing starts based on a temporary noise (burst error) or the like which may occur on an otherwise active line.
  • A line that is used for joint signal processing can be released to normal operation when the CPE is switched on (again) and the CO detects a training signal coming from the CPE.
  • In UPLINK direction, the CO may perform joint signal processing using linear or non-linear MIMO detection techniques via its active ports plus any ports (or a selection thereof) connected to inactive users. The additional degrees of freedom of the additional ports conveying no user data or idle data can be efficiently utilized for a better interference suppression between the active communication lines.
  • In DOWNLINK direction, the CO may perform a joint signal pre-processing using linear or non-linear MIMO pre-coding techniques via its active ports plus any ports connected to inactive users. The additional degrees of freedom of the additional ports at the transmit side can be used for an improved suppression of inter-line crosstalk between the other communication pairs due to an additional transmit diversity.
  • It is an advantage that in pre-coded downlink direction a high transmission power can be used to achieve interference cancellation at the transmit side. This is applicable as there is no user data transmitted over the inactive line. Hence, the at least one inactive line may allow for a simplified linear pre-coding technique to provide an efficient interference cancellation.
  • A pre-compensation of inter-stream interference may result in a substantial SINR improvement for individual links in downlink direction.
  • The solution suggested is in particular compatible with existing CPEs. Regarding joint signal processing in uplink direction, information required is available at the CO side. Hence, no changes of the CPE hardware and/or firmware are required. For joint signal pre-processing in downlink direction, no changes of the CPE hardware is needed. However, in order to provide a feedback channel from the CPE to the CO to be utilized for an improved performance, a firmware upgrade of the CPE may be beneficial.
  • Fig.1 shows steps of a method to provide an efficient data communication in a point to multipoint environment. In a step 101, the CO determines at least one inactive line. Such inactive line may be detected upon receiving a corresponding notification or message indicating that the remote CPE enters an offline state or is actually being switched off.
  • In a step 102, the CO provides joint signal processing considering incoming traffic on several ports, wherein at least one of such ports is connected to an inactive line (or via such line to an inactive CPE). Knowing which ports are connected to inactive lines, the CO can actively process incoming traffic and hence reduce an interference and/or crosstalk of the traffic conveyed via the still active connections (i.e. connections to still active CPEs).
  • In a step 103, the CO performs a joint signal pre-processing by modifying signals to be conveyed over the lines (including the line(s) connected to inactive CPE(s)) in a way that interference and/or crosstalk is reduced.
  • Hence, joint signal processing as well as joint signal pre-processing allows to significantly reduce crosstalk effects and hence improves the overall SINR.
    • List of Abbreviations:
    • CO
    Central Office
    CPE
    Customer Premises Equipment
    DSL
    Digital Subscriber Line
    DSLAM
    Digital Subscriber Line Access Multiplexer
    SINR
    Signal to Interference plus Noise Ratio
    UT
    User Terminal

Claims (11)

  1. A method for signal processing in a digital subscriber line system, wherein a central office is connected to multiple customer premises equipments via multiple lines, comprising the steps of:
    - determining via a feedback channel from the user premises equipment to the central office at least one line where no user data and no idle signals are transmitted; and
    - utilizing the at least one line determined for, in uplink direction from the user premises equipments to the central office, detecting crosstalk from the further lines and/or for, in downlink direction from the central office to the customer premises equipments, interference cancellation.
  2. The method according to claim 1, wherein said data processing is provided in a point to multipoint environment.
  3. The method according to any of the preceding claims,
    wherein the at least one line determined is detected by the central office upon notification by a customer premises equipment.
  4. The method according to any of the preceding claims,
    wherein the at least one line determined is utilized by actively conveying signals in order to reduce a crosstalk and/or interference.
  5. The method according to any of the preceding claims,
    wherein the at least one line determined is released for normal operation upon detection of a pre-defined signal.
  6. The method according to claim 5, wherein the predefined signal is a training signal.
  7. A communication system arranged such that the method according to any of the preceding claims is executable.
  8. A device for signal processing in a digital subscriber line system, the device being connectable to multiple customer premises equipments via multiple lines, comprising means for:
    - determining via a feedback channel from the user premises equipment to the device at least one line where no user data and no idle signals are transmitted; and
    - utilizing the at least one line determined for, in uplink direction from the user premises equipments to the device, detecting crosstalk from the further lines and/or for, in downlink direction from the device to the customer premises equipments, pre-coding.
  9. The device according to claim 8, wherein the device is a digital subscriber line access multiplexer.
  10. A device for signal processing in a digital subscriber line system comprising means for notifying a central office according to claims 8 or 9 of at least one line where no user data and no idle signals are transmitted to enable the central office to perform the method according to any of claims 1 to 6.
  11. A device according to claim 10, wherein the device is a customer premises equipment.
EP08104987.6A 2008-08-07 2008-08-07 Method and device for data processing and communication system comprising such device Active EP2151965B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP08104987.6A EP2151965B1 (en) 2008-08-07 2008-08-07 Method and device for data processing and communication system comprising such device
PCT/EP2009/060269 WO2010015699A1 (en) 2008-08-07 2009-08-07 Method and device for data processing and communication system comprising such device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08104987.6A EP2151965B1 (en) 2008-08-07 2008-08-07 Method and device for data processing and communication system comprising such device

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EP2151965A1 EP2151965A1 (en) 2010-02-10
EP2151965B1 true EP2151965B1 (en) 2018-01-17

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WO (1) WO2010015699A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013163658A1 (en) * 2012-04-28 2013-10-31 Eden Rock Communications, Llc Method and system for measuring availability in a communications network

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1620967A1 (en) * 2002-07-03 2006-02-01 Wireless Lan Systems Oy Power control of digital subscriber line
KR101124932B1 (en) * 2005-05-30 2012-03-28 삼성전자주식회사 Apparatus and method for transmitting/receiving a data in mobile communication system with array antennas
DE102006051435B4 (en) * 2006-10-31 2009-07-30 Nokia Siemens Networks Gmbh & Co.Kg Method, arrangement and device for transmitting data over multiple channels

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WO2010015699A1 (en) 2010-02-11
EP2151965A1 (en) 2010-02-10

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